Reinforcing a cave wall with a [[support beam]] lowers the chance of cave-ins, but reinforced walls cannot be excavated or mined. Ore veins are said to count as reinforced for purposes of stability.
Note: The only cave-ins/tile collapse that I have seen are those next to other unmined tiles.
For example: If you mine a three (3) tile wide path, the center tile won't cave in but the outter tiles will have a chance to cave in...
== Skill and difficulty ==